Absolutely best decluttering book ever: The life changing magic of tidying up. Even (especially) works with teenagers! Here is article by girl - "I Decluttered My Closet With The KonMari Method And Here's What Happened"
cup cornstarch, 1 cup baking soda, cup water, a small saucepan, and a spoon. Heat the mixture over medium heat and stir constantly. Remove from the heat and let the clay cool until you can handle it comfortably. Knead it for a minute to make it r